Extremely low in particle generation and soluble extractables. They have laser heat sealed edges, are laundered in ultrafiltered water and dried in a HEPA filtered Class 10 air stream. Each wipe is inspected and sealed in packages within a Class 10 cleanroom. This wiper is two ply, perforated and is made of 100% continuous-filament 85 denier standard weight polyester in a double-knit interlock, no-run circular pattern, heat sealed edge. Sold by case only.